#ifndef _SERIAL_H_
#define _SERIAL_H_

#define U8  unsigned char
#define U16 unsigned int
#define S8  signed char
#define S16 signed int


void serial_init(void);
U8 RS_ready(void);
U8 RS_rx(void);
void RS_tx(U8 tx_buf);

#endif  //_SERIAL_H_
